PHP array_diff_assoc() function

The array_diff_assoc() function is used to compare an array against another array and returns the difference. In other words, we can say that array_diff_assoc() function compares the keys and values of two or more arrays and return an array that contains the entries from array1 that are not present in array2 or array3. This function was introduced in PHP 4.3.

Syntax

Parameter	Description	Is compulsory
array1	The array to compare form	compulsory
array2	An array to compare against	compulsory
array3	More arrays to compare against	optional

Return Type

Returns an array containing all the values from array1 that are not present in any of the other arrays.

Example 1

<?php
$a1=array("1"=>"red","2"=>"green","3"=>"blue","4"=>"black");
$a2=array("1"=>"red","2"=>"blue","3"=>"green");
$result=array_diff_assoc($a1,$a2);
print_r($result);
?>

Output:

Array ( [2] => green [3] => blue  [4] => black  )

Example 2

<?php
$fruit1 = array( "a"=>"orange", "b"=>"mango", "c"=>"banana");
$fruit2 = array( "a"=>"orange", "b"=>"apple", "c"=>"banana");
print_r(array_diff_assoc($fruit1, $fruit2));
?>

Output:

Array (  [b] => mango  )

Example 3

<?php 
$fruit1 = array( "a"=>"orange", "b"=>"mango", "c"=>"banana");
$fruit2 = array( "a"=>"banana", "b"=>"apple", "c"=>"orange");
print_r(array_diff_assoc($fruit1, $fruit2));
?>

Output:

Array ( [a] => orange [b] => mango [c] => banana )

Example 4

<?php
$a1=array(
array(
"1"=>"red"	
),
array(
"2"=>"green"
 ),
array(
"3"=>"blue" 
),
array(
"4"=>"black" ) );
$a2=array(
array(
"1"=>"red"
),
array(
"2"=>"blue"
),
array(
"3"=>"green" ) );
$result=array_diff_assoc($a1,$a2);
print_r($result);
?>

Output:

Array(  [3]=> Array ( [4] => black ) )

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